TW201419659A - Decoupling circuit and antenna device - Google Patents

Decoupling circuit and antenna device Download PDF

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Publication number
TW201419659A
TW201419659A TW101141134A TW101141134A TW201419659A TW 201419659 A TW201419659 A TW 201419659A TW 101141134 A TW101141134 A TW 101141134A TW 101141134 A TW101141134 A TW 101141134A TW 201419659 A TW201419659 A TW 201419659A
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Taiwan
Prior art keywords
metal strip
antennas
substrate
disposed
metal
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TW101141134A
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Chinese (zh)
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TWI497824B (en
Inventor
I-Shan Chen
Chao-Chun Lin
Yi-Chieh Wang
Cheng-Hsiung Hsu
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Wistron Neweb Corp
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Priority to TW101141134A priority Critical patent/TWI497824B/en
Priority to US13/789,613 priority patent/US8957825B2/en
Publication of TW201419659A publication Critical patent/TW201419659A/en
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Publication of TWI497824B publication Critical patent/TWI497824B/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

A decoupling circuit for enhancing isolation of two antennas is disclosed. The two antennas are substantially symmetrically disposed on a substrate. The decoupling circuit includes a first and second metal strips parallel disposed between the two antennas and electrically connected to a ground, a connection strip electrically connected between terminals of the first and second metal strips, to substantially form a doorframe structure, a first comb structure comprising a plurality of metal segments parallel to each other, disposed on the substrate, electrically connected to and perpendicular to the first metal strip, and a second comb structure comprising a plurality of metal segments parallel to each other, disposed on the substrate, electrically connected to and perpendicular to the second metal strip.

Description

去耦合電路及天線裝置 Decoupling circuit and antenna device

本發明係指一種去耦合電路及天線裝置，尤指一種可抑制天線間耦合作用，以提升天線隔離度之去耦合電路及天線裝置。 The present invention relates to a decoupling circuit and an antenna device, and more particularly to a decoupling circuit and an antenna device capable of suppressing coupling between antennas to improve antenna isolation.

具有無線通訊功能的電子產品係透過天線來發射或接收無線電波，以傳遞或交換無線電訊號，進而存取無線網路。因此，為了讓使用者能更方便地存取無線通訊網路，理想天線的頻寬應在許可範圍內儘可能地增加，而尺寸則應儘量減小，以配合電子產品體積縮小之趨勢。除此之外，隨著無線通訊技術不斷演進，電子產品所配置的天線數量可能增加。舉例來說，長期演進(Long Term Evolution，LTE)無線通訊系統及無線區域網路標準IEEE 802.11n支援多輸入多輸出(Multi-input Multi-output，MIMO)通訊技術，亦即相關電子產品可透過多重(或多組)天線同步收發無線訊號，以在不增加頻寬或總發射功率耗損(Transmit Power Expenditure)的情況下，大幅地增加系統的資料吞吐量(Throughput)及傳送距離，進而有效提升無線通訊系統之頻譜效率及傳輸速率，改善通訊品質。 An electronic product with wireless communication functions transmits or receives radio waves through an antenna to transmit or exchange radio signals to access a wireless network. Therefore, in order to make it easier for users to access the wireless communication network, the bandwidth of the ideal antenna should be increased as much as possible within the allowable range, and the size should be minimized to match the trend of shrinking electronic products. In addition, as wireless communication technologies continue to evolve, the number of antennas configured for electronic products may increase. For example, the Long Term Evolution (LTE) wireless communication system and the wireless local area network standard IEEE 802.11n support multi-input multi-output (MIMO) communication technology, that is, related electronic products are permeable. Multiple (or multiple sets of) antennas synchronously transmit and receive wireless signals to significantly increase the system's data throughput (Throughput) and transmission distance without increasing bandwidth or total transmit power loss (Transmit Power Expenditure) The spectrum efficiency and transmission rate of wireless communication systems improve communication quality.

由上述可知，要實現多輸入多輸出功能中空間多工、多樣技術，先決條件必需搭配多組天線，以將空間分成許多通道，進而提供多 個天線場型。當同一電子產品在有限空間下配置多組天線時，通訊上的基本需求之一是這些天線都是獨立，彼此不會相互影響，且具有良好的隔離度，因此降低天線之間互相耦合的現象就成為業界所努力的目標之一。然而，在有限空間下，要提高天線隔離度同時又要維持多輸入多輸出之資料吞吐量，勢必增加許多設計難度。因此，如何設計符合傳輸需求的天線，同時兼顧尺寸及功能，已成為業界所努力的目標之一。 It can be seen from the above that in order to realize spatial multiplexing and multiple technologies in the multi-input and multi-output functions, it is necessary to match multiple sets of antennas in order to divide the space into many channels, thereby providing more Antenna field type. When the same electronic product is configured with multiple sets of antennas in a limited space, one of the basic requirements of communication is that these antennas are independent, do not affect each other, and have good isolation, thus reducing the mutual coupling between the antennas. It has become one of the goals of the industry. However, in a limited space, to improve the antenna isolation while maintaining the data throughput of multiple input and multiple output, it is bound to increase the design difficulty. Therefore, how to design an antenna that meets the transmission requirements while taking into account the size and function has become one of the goals of the industry.

因此，本發明主要提供一種去耦合電路及天線裝置，其可降低天線之間互相耦合的現象，以提升天線效率。 Therefore, the present invention mainly provides a decoupling circuit and an antenna device, which can reduce the phenomenon of mutual coupling between antennas to improve antenna efficiency.

本發明揭露一種去耦合電路，用來提升二天線間之隔離度，該二天線大致對稱地設置於一基板上，該去耦合電路包含有一第一金屬條，設置於該基板上該二天線間，且電性連接於一地端；一第二金屬條，設置於該基板上該二天線間，大致平行於該第一金屬條，且電性連接於該地端；一金屬連接條，設置於該基板上該二天線間，並電性連接該第一金屬條之一端及該第二金屬條之一端，以與該第一金屬條及該第二金屬條大致形成一門框結構；一第一梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第一金屬條，並與該第一金屬條垂直；以及一第二梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第二金屬條，並與該第二金屬條垂直。 The present invention discloses a decoupling circuit for improving the isolation between two antennas. The two antennas are disposed substantially symmetrically on a substrate. The decoupling circuit includes a first metal strip disposed on the substrate. And electrically connected to a ground end; a second metal strip disposed on the substrate between the two antennas, substantially parallel to the first metal strip, and electrically connected to the ground end; a metal connecting strip, set Between the two antennas on the substrate, and electrically connecting one end of the first metal strip and one end of the second metal strip to form a door frame structure with the first metal strip and the second metal strip; a comb-shaped structure comprising a plurality of metal line segments disposed on the substrate in parallel with each other and electrically connected to the first metal strip and perpendicular to the first metal strip; and a second comb structure including A plurality of metal segments are disposed on the substrate in parallel with each other and electrically connected to the second metal strip and perpendicular to the second metal strip.

本發明另揭露一種天線裝置，包含有一基板；二天線，大致對稱地設置於該基板上；以及一去耦合電路，包含有一第一金屬條，設置於該基板上該二天線間，且電性連接於一地端；一第二金屬條，設置於該基板上該二天線間，大致平行於該第一金屬條，且電性連接於該地端；一金屬連接條，設置於該基板上該二天線間，並電性連接該第一金屬條之一端及該第二金屬條之一端，以與該第一金屬條及該第二金屬條大致形成一門框結構；一第一梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第一金屬條，並與該第一金屬條垂直；以及一第二梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第二金屬條，並與該第二金屬條垂直。 The invention further discloses an antenna device comprising a substrate; two antennas disposed substantially symmetrically on the substrate; and a decoupling circuit comprising a first metal strip disposed on the substrate between the two antennas and electrically Connected to a ground end; a second metal strip is disposed on the substrate between the two antennas, substantially parallel to the first metal strip, and electrically connected to the ground end; a metal connecting strip is disposed on the substrate Between the two antennas, electrically connecting one end of the first metal strip and one end of the second metal strip to form a door frame structure with the first metal strip and the second metal strip; a first comb structure Included in the plurality of metal segments, disposed on the substrate in parallel with each other and electrically connected to the first metal strip and perpendicular to the first metal strip; and a second comb structure including a plurality of metals The line segments are disposed on the substrate in a mutually parallel manner and are electrically connected to the second metal strip and perpendicular to the second metal strip.

請參考第1圖，第1圖為本發明實施例一天線裝置10之示意圖。天線裝置10包含有一基板100、一第一天線102、一第二天線104及一去耦合電路106。基板100可為一印刷電路板或一電子裝置之殼體的一部分，若為電子裝置之殼體的一部分，則基板100可能配合機構外型設計而包含有凹凸、起伏、穿孔等結構，或者具可撓性。然而，為求簡潔並清楚說明本發明之概念，先以平板式之基板100為例進行說明。第一天線102及第二天線104皆為單極天線，並大致對稱地設置於基板100上。去耦合電路106係以導電材質製 成，並設置於基板100上第一天線102及第二天線104之間，用以抑制天線間耦合作用，以提升天線隔離度，藉此可維持或提升多輸入多輸出之資料吞吐量。 Please refer to FIG. 1. FIG. 1 is a schematic diagram of an antenna device 10 according to an embodiment of the present invention. The antenna device 10 includes a substrate 100, a first antenna 102, a second antenna 104, and a decoupling circuit 106. The substrate 100 can be a printed circuit board or a part of a housing of an electronic device. If it is part of the housing of the electronic device, the substrate 100 may have a structure such as irregularities, undulations, perforations, etc., or Flexible. However, in order to clarify and clearly illustrate the concept of the present invention, a flat substrate 100 will be described as an example. The first antenna 102 and the second antenna 104 are both monopole antennas and are disposed substantially symmetrically on the substrate 100. Decoupling circuit 106 is made of conductive material And disposed between the first antenna 102 and the second antenna 104 on the substrate 100 to suppress coupling between the antennas to improve antenna isolation, thereby maintaining or improving data throughput of multiple inputs and multiple outputs .

詳細來說，去耦合電路106包含有一第一金屬條108、一第二金屬條110、一金屬連接條112、一第一梳形結構114及一第二梳形結構116。第一金屬條108及第二金屬條110係平行設置於基板100上，並電性連接於地端。金屬連接條112設置於基板100上，並電性連接第一金屬條108及第二金屬條110之頂端，以與第一金屬條108及第二金屬條110大致形成一門框結構(即類似於ㄇ或Π型)。其中，第一金屬條108與第一天線102之距離約為待收發無線訊號的1/4波長，同樣地，第二金屬條110與第二天線104之距離亦約為待收發無線訊號的1/4波長。另一方面，第一梳形結構114係由多個金屬線段118所組成，金屬線段118相互平行地設置於基板100上並電性連接於第一金屬條110，彼此間隔待收發無線訊號的1/10到1/20波長。同理，第二梳形結構116係由多個金屬線段120所組成，金屬線段120相互平行地設置於基板100上並電性連接於第二金屬條112，彼此間隔待收發無線訊號的1/10到1/20波長。另外，金屬線段118、120分別與第一金屬條110及第二金屬條112垂直，更精確來說，係與天線垂直極化方向正交。 In detail, the decoupling circuit 106 includes a first metal strip 108, a second metal strip 110, a metal connecting strip 112, a first comb structure 114, and a second comb structure 116. The first metal strip 108 and the second metal strip 110 are disposed on the substrate 100 in parallel and electrically connected to the ground end. The metal connecting strips 112 are disposed on the substrate 100 and electrically connected to the top ends of the first metal strips 108 and the second metal strips 110 to form a door frame structure with the first metal strips 108 and the second metal strips 110 (ie, similar to ㄇ or Π type). The distance between the first metal strip 108 and the first antenna 102 is about 1/4 of the wavelength of the wireless signal to be transmitted and received. Similarly, the distance between the second metal strip 110 and the second antenna 104 is also about the wireless signal to be sent and received. 1/4 wavelength. On the other hand, the first comb structure 114 is composed of a plurality of metal line segments 118. The metal line segments 118 are disposed on the substrate 100 in parallel with each other and electrically connected to the first metal strip 110, and are spaced apart from each other by the wireless signal. /10 to 1/20 wavelength. Similarly, the second comb structure 116 is composed of a plurality of metal line segments 120. The metal line segments 120 are disposed on the substrate 100 in parallel with each other and electrically connected to the second metal strip 112, and are spaced apart from each other by a wireless signal. 10 to 1/20 wavelength. In addition, the metal segments 118, 120 are perpendicular to the first metal strip 110 and the second metal strip 112, respectively, more precisely orthogonal to the vertical polarization direction of the antenna.

因此，由於第一金屬條108、第二金屬條110及金屬連接條112所形成之門框型接地結構係與第一、二天線102、104位於同一平 面，又介於第一、二天線102、104之間，可有效利用空間隔離耦合效果，同時金屬線段118、120也可有效避免相對應頻段之直接波的傳遞。在此情形下，以LTE應用所需的頻段而言，第一天線102與第二天線104的涵蓋寬度可低於4公分，因而可提升空間利用率。 Therefore, the gate frame type ground structure formed by the first metal strip 108, the second metal strip 110 and the metal connecting strip 112 is in the same level as the first and second antennas 102 and 104. The surface is also interposed between the first and second antennas 102 and 104, and the space isolation coupling effect can be effectively utilized, and the metal line segments 118 and 120 can also effectively avoid the direct wave transmission of the corresponding frequency band. In this case, the coverage width of the first antenna 102 and the second antenna 104 may be less than 4 cm in terms of the frequency band required for the LTE application, thereby improving space utilization.

需注意的是，第1圖係為本發明實施例，本領域具通常知識者當可據以做不同之修飾，而不限於此。舉例來說，請參考第2圖，第2圖為本發明實施例一天線裝置20之示意圖。天線裝置20之結構及運作方法與第1圖之天線裝置10相似，故相同元件以相同符號表示。天線裝置20與天線裝置10不同處在於天線裝置20之一去耦合電路206較去耦合電路106多增加了一第三金屬條200及一第四金屬條202，其同樣可抑制天線間耦合作用，以提升天線隔離度。詳細來說，第三金屬條200設置於第一金屬條108與第一天線102間，同樣電性連接於地端，而第四金屬條202則設置於第二金屬條110與第二天線104間，同樣電性連接於地端。第三金屬條200及第四金屬條202可調整頻寬，以增加設計彈性。 It should be noted that the first drawing is an embodiment of the present invention, and those skilled in the art can make different modifications according to the present invention, and are not limited thereto. For example, please refer to FIG. 2, which is a schematic diagram of an antenna device 20 according to an embodiment of the present invention. The structure and operation of the antenna device 20 are similar to those of the antenna device 10 of Fig. 1, and therefore the same elements are denoted by the same reference numerals. The difference between the antenna device 20 and the antenna device 10 is that one of the decoupling circuit 206 of the antenna device 20 adds a third metal strip 200 and a fourth metal strip 202 to the decoupling circuit 106, which can also suppress the coupling between the antennas. To improve antenna isolation. In detail, the third metal strip 200 is disposed between the first metal strip 108 and the first antenna 102, and is also electrically connected to the ground end, and the fourth metal strip 202 is disposed on the second metal strip 110 and the next day. Line 104 is also electrically connected to the ground. The third metal strip 200 and the fourth metal strip 202 can adjust the bandwidth to increase design flexibility.

此外，如前所述，基板100可為印刷電路板。在此情形下，天線裝置10、20可以直立方式設置於一底座上。舉例來說，第3圖為天線裝置20以直立方式設置於一底座300之示意圖。在第3圖中，底座300中可能包含有用來固定天線裝置20之機構、處理射頻訊號之射頻電路、處理器等，視不同應用而定。 Further, as previously described, the substrate 100 can be a printed circuit board. In this case, the antenna devices 10, 20 can be placed on a base in an upright manner. For example, FIG. 3 is a schematic diagram of the antenna device 20 disposed on a base 300 in an upright manner. In FIG. 3, the base 300 may include a mechanism for fixing the antenna device 20, a radio frequency circuit for processing an RF signal, a processor, etc., depending on different applications.

另一方面，在第1圖或第2圖中，第一金屬條108與第二金屬條110為不等長，但亦可為等長，視系統需求而定。同樣地，第三金屬條200及第四金屬條202之長度亦可為等長或不等長。此外，在第1圖或第2圖中，第一天線102及第二天線104係為大致對稱之形式，兩者皆為三個門框型單極天線所組合而成，此門框型結構可產生電容性效果，有效縮短天線長度，且其一之單極天線結構為小於相對應頻率之四分之一波長。另外，第一天線102及第二天線104之形狀或尺寸可依系統需求各別調整，或者可採用其它形式之天線。舉例來說，請參考第4圖，第4圖為本發明實施例一天線裝置40之示意圖。天線裝置40之結構及運作方法與第1圖之天線裝置10相似，包含有一基板400、一第一天線402、一第二天線404及一去耦合電路406。去耦合電路406之運作方式與架構與第1圖中去耦合電路106相同，同樣用來抑制天線間耦合作用，以提升天線隔離度，藉此維持或提升多輸入多輸出之資料吞吐量。天線裝置40與天線裝置10不同處在於天線裝置40之第一天線402及第二天線404係為平面倒F式天線(Planar Inverted F Antenna)，其亦符合本發明之應用範圍。當然，天線裝置40亦可如第2圖之例增加第三、四金屬條，或者如第5圖所示，亦可直立設置於一底座500上。 On the other hand, in the first or second figure, the first metal strip 108 and the second metal strip 110 are unequal lengths, but may be of equal length, depending on system requirements. Similarly, the length of the third metal strip 200 and the fourth metal strip 202 may be equal or unequal length. In addition, in FIG. 1 or FIG. 2, the first antenna 102 and the second antenna 104 are in a substantially symmetrical form, and both are combined by three door frame type monopole antennas. It can produce a capacitive effect, effectively shortening the length of the antenna, and one of the monopole antenna structures is less than a quarter of the wavelength of the corresponding frequency. In addition, the shape or size of the first antenna 102 and the second antenna 104 may be individually adjusted according to system requirements, or other forms of antennas may be used. For example, please refer to FIG. 4, which is a schematic diagram of an antenna device 40 according to an embodiment of the present invention. The antenna device 40 is similar in structure and operation to the antenna device 10 of FIG. 1 and includes a substrate 400, a first antenna 402, a second antenna 404, and a decoupling circuit 406. The decoupling circuit 406 operates in the same manner and architecture as the decoupling circuit 106 of FIG. 1, and is also used to suppress the coupling between the antennas to enhance the antenna isolation, thereby maintaining or improving the data throughput of the multiple input and multiple outputs. The difference between the antenna device 40 and the antenna device 10 is that the first antenna 402 and the second antenna 404 of the antenna device 40 are Planar Inverted F Antennas, which are also in accordance with the scope of application of the present invention. Of course, the antenna device 40 can also add third or fourth metal strips as in the example of FIG. 2, or can be erected on a base 500 as shown in FIG.

在前述實施例中，基板100、400係以平面結構為例，然而，如前所述，基板100可為一電子裝置之殼體的一部分，亦即可能因外型設計而包含有凹凸、起伏、穿孔等結構。在此情形下，本發明之去耦合電路亦可抑制天線間耦合作用，以提升天線隔離度。舉例來 說，請參考第6圖，第6圖為本發明實施例一天線裝置60之剖視示意圖。天線裝置60包含有一基板600、一第一天線602、一第二天線604及一去耦合電路606。比較第6圖之天線裝置60與第2圖或第3圖之天線裝置20可知，天線裝置60之架構與天線裝置20相同，故同樣可透過去耦合電路606抑制天線間耦合作用，以提升天線隔離度，藉此維持或提升多輸入多輸出之資料吞吐量。天線裝置60與天線裝置20不同之處在於基板600為一汽車車頂天線中殼體的一部分，換言之，第一天線602、第二天線604及去耦合電路606係設置或直接形成於汽車車頂天線殼體的內側，而形成的方式可以是雷射直接成型(Laser Direct Structuring，LDS)，或是利用導電塗料材料進行塗佈、印刷、技術蒸鍍(Evaporation deposition)，或是製作在產品之殼體表面再以漆或是膠塗佈做隔絕接觸等，且不限於此。 In the foregoing embodiment, the substrate 100 and 400 are exemplified by a planar structure. However, as described above, the substrate 100 may be a part of a housing of an electronic device, that is, may include irregularities and undulations due to an external design. , perforation and other structures. In this case, the decoupling circuit of the present invention can also suppress the coupling between the antennas to improve the antenna isolation. For example Referring to FIG. 6, FIG. 6 is a cross-sectional view of an antenna device 60 according to an embodiment of the present invention. The antenna device 60 includes a substrate 600, a first antenna 602, a second antenna 604, and a decoupling circuit 606. Comparing the antenna device 60 of FIG. 6 with the antenna device 20 of FIG. 2 or FIG. 3, the structure of the antenna device 60 is the same as that of the antenna device 20. Therefore, the decoupling circuit 606 can also be used to suppress the coupling between the antennas to enhance the antenna. Isolation to maintain or increase the data throughput of multiple inputs and multiple outputs. The antenna device 60 is different from the antenna device 20 in that the substrate 600 is a part of a casing in a car roof antenna. In other words, the first antenna 602, the second antenna 604, and the decoupling circuit 606 are disposed or directly formed in the automobile. The inside of the roof antenna housing can be formed by Laser Direct Structuring (LDS), coated or printed with conductive coating materials, or evaporated. The surface of the shell of the product is coated with paint or glue to provide insulation, etc., and is not limited thereto.

另外，天線裝置60之尺寸、材質等性質可依所需應用之系統而適調整，以應用於LTE系統而言，第一天線602與第二天線604的涵蓋寬度可低於4公分，因而可提升空間利用率。另外，當天線裝置60應用於LTE系統時的多輸入多輸出效能，可進一步參考第7A、7B、8、9A、9B、10A、10B圖。第7A、7B圖為天線裝置60應用於LTE系統進行多輸入多輸出運作時的電壓駐波比(即S11、S22參數)示意圖，第8圖為天線裝置60應用於LTE系統進行多輸入多輸出運作時的隔離度(即S21參數)示意圖。在第7A、7B、8圖中，虛線及實線分別表示以第一天線602及第二天線604進行量測或模擬的結果。由此可知，天線裝置60在2.02~2.25 GHz匹配 較好的頻段，尚可獲得20~35 dB的隔離度。另外，第9A、9B圖為天線裝置60應用於LTE系統進行多輸入多輸出運作時第一天線602及第二天線604之輻射效率圖，而第10A、10B圖為天線裝置60應用於LTE系統進行多輸入多輸出運作時第一天線602及第二天線604之二維電場(E-plane)場型圖。因此，由第7A、7B圖至第10A、10B圖可以看出，即使在有限空間下，天線裝置60仍可於進行多輸入多輸出運作時具有適當頻寬及良好隔離度、輻射效率等。 In addition, the size, material, and the like of the antenna device 60 can be adjusted according to the system of the application to be applied. For the LTE system, the coverage width of the first antenna 602 and the second antenna 604 can be less than 4 cm. Therefore, space utilization can be improved. In addition, when the antenna device 60 is applied to the LTE system for multiple-input multiple-output performance, reference may be made to FIGS. 7A, 7B, 8, 9A, 9B, 10A, and 10B. 7A and 7B are schematic diagrams showing the voltage standing wave ratio (ie, S11 and S22 parameters) when the antenna device 60 is applied to the LTE system for multi-input and multi-output operation, and FIG. 8 is the antenna device 60 applied to the LTE system for multiple input and multiple output. Schematic diagram of isolation (ie, S21 parameters) during operation. In FIGS. 7A, 7B, and 8 , the broken line and the solid line indicate the results of measurement or simulation by the first antenna 602 and the second antenna 604, respectively. It can be seen that the antenna device 60 is matched at 2.02~2.25 GHz. For better frequency bands, isolation of 20 to 35 dB is still available. In addition, FIGS. 9A and 9B are radiation efficiency diagrams of the first antenna 602 and the second antenna 604 when the antenna device 60 is applied to the LTE system for performing multiple input and multiple output operations, and FIGS. 10A and 10B are diagrams for applying the antenna device 60. A two-dimensional electric field (E-plane) field pattern of the first antenna 602 and the second antenna 604 when the LTE system performs multi-input and multi-output operation. Therefore, it can be seen from FIGS. 7A, 7B to 10A, 10B that even in a limited space, the antenna device 60 can have an appropriate bandwidth, good isolation, radiation efficiency, and the like when performing multiple input and multiple output operations.

綜上所述，本發明之去耦合電路可有效提升天線隔離度，除有助於空間充分利用外，並可抑制天線間耦合作用，以維持或提升多輸入多輸出之資料吞吐量。 In summary, the decoupling circuit of the present invention can effectively improve the antenna isolation, in addition to contributing to the full utilization of space, and can suppress the coupling between antennas to maintain or improve the data throughput of multiple input and multiple outputs.

以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

10‧‧‧天線裝置 10‧‧‧Antenna device

100、400、600‧‧‧基板 100, 400, 600‧‧‧ substrates

102、402、602‧‧‧第一天線 102, 402, 602‧‧‧ first antenna

104、404、604‧‧‧第二天線 104, 404, 604‧‧‧ second antenna

106、206、406、606‧‧‧去耦合電路 106, 206, 406, 606‧‧‧ decoupling circuits

108‧‧‧第一金屬條 108‧‧‧First metal strip

110‧‧‧第二金屬條 110‧‧‧Second metal strip

112‧‧‧金屬連接條 112‧‧‧Metal connecting strip

114‧‧‧第一梳形結構 114‧‧‧First comb structure

116‧‧‧第二梳形結構 116‧‧‧Second comb structure

118、120‧‧‧金屬線段 118, 120‧‧‧Metal segments

200‧‧‧第三金屬條 200‧‧‧third metal strip

202‧‧‧第四金屬條 202‧‧‧4th metal strip

300、500‧‧‧底座 300, 500‧‧‧ base

第1圖為本發明實施例一天線裝置之示意圖。 FIG. 1 is a schematic diagram of an antenna apparatus according to an embodiment of the present invention.

第2圖為本發明實施例一天線裝置之示意圖。 FIG. 2 is a schematic diagram of an antenna apparatus according to an embodiment of the present invention.

第3圖為第2圖之天線裝置以直立方式設置於一底座之示意圖。 Fig. 3 is a schematic view showing the antenna device of Fig. 2 disposed on a base in an upright manner.

第4圖為本發明實施例一天線裝置之示意圖。 Figure 4 is a schematic diagram of an antenna device according to an embodiment of the present invention.

第5圖為第4圖之天線裝置以直立方式設置於一底座之示意圖。 Fig. 5 is a schematic view showing the antenna device of Fig. 4 disposed on a base in an upright manner.

第6圖為本發明實施例一天線裝置之剖視示意圖。 Figure 6 is a cross-sectional view showing an antenna device according to an embodiment of the present invention.

第7A、7B圖為第6圖之天線裝置應用於長期演進無線通訊系 統進行多輸入多輸出運作時的電壓駐波比示意圖。 7A and 7B are diagrams of the antenna device of FIG. 6 applied to the long-term evolution wireless communication system Schematic diagram of voltage standing wave ratio when multi-input and multi-output operation is performed.

第8圖為第6圖之天線裝置應用於長期演進無線通訊系統進行多輸入多輸出運作時的隔離度示意圖。 Fig. 8 is a schematic diagram showing the isolation of the antenna device of Fig. 6 applied to the long-term evolution wireless communication system for multi-input and multi-output operation.

第9A、9B圖為第6圖之天線裝置應用於長期演進無線通訊系統進行多輸入多輸出運作時一第一天線及一第二天線之輻射效率圖。 9A and 9B are radiation efficiency diagrams of a first antenna and a second antenna when the antenna device of FIG. 6 is applied to a multi-input and multi-output operation of a long-term evolution wireless communication system.

第10A、10B圖為第6圖之天線裝置應用於長期演進無線通訊系統進行多輸入多輸出運作時一第一天線及一第二天線之二維電場場型圖。 10A and 10B are diagrams showing a two-dimensional electric field pattern of a first antenna and a second antenna when the antenna device of FIG. 6 is applied to a multi-input and multi-output operation of a long-term evolution wireless communication system.

10‧‧‧天線裝置 10‧‧‧Antenna device

100‧‧‧基板 100‧‧‧Substrate

102‧‧‧第一天線 102‧‧‧first antenna

104‧‧‧第二天線 104‧‧‧second antenna

106‧‧‧去耦合電路 106‧‧‧Decoupling circuit

108‧‧‧第一金屬條 108‧‧‧First metal strip

110‧‧‧第二金屬條 110‧‧‧Second metal strip

112‧‧‧金屬連接條 112‧‧‧Metal connecting strip

114‧‧‧第一梳形結構 114‧‧‧First comb structure

116‧‧‧第二梳形結構 116‧‧‧Second comb structure

118、120‧‧‧金屬線段 118, 120‧‧‧Metal segments

Claims (20)

一種去耦合電路，用來提升二天線間之隔離度，該二天線大致對稱地設置於一基板上，該去耦合電路包含有：一第一金屬條，設置於該基板上該二天線間，且電性連接於一地端；一第二金屬條，設置於該基板上該二天線間，大致平行於該第一金屬條，且電性連接於該地端；一金屬連接條，設置於該基板上該二天線間，並電性連接該第一金屬條之一端及該第二金屬條之一端，以與該第一金屬條及該第二金屬條大致形成一門框結構；一第一梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第一金屬條，並與該第一金屬條垂直；以及一第二梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第二金屬條，並與該第二金屬條垂直。 A decoupling circuit for improving the isolation between two antennas. The two antennas are disposed substantially symmetrically on a substrate. The decoupling circuit includes: a first metal strip disposed on the substrate between the two antennas. And electrically connected to a ground end; a second metal strip is disposed on the substrate between the two antennas, substantially parallel to the first metal strip, and electrically connected to the ground end; a metal connecting strip is disposed on Between the two antennas on the substrate, and electrically connecting one end of the first metal strip and one end of the second metal strip to form a door frame structure with the first metal strip and the second metal strip; The comb-shaped structure includes a plurality of metal wire segments disposed on the substrate in parallel with each other and electrically connected to the first metal strip and perpendicular to the first metal strip; and a second comb structure including A plurality of metal segments are disposed on the substrate in parallel with each other and electrically connected to the second metal strip and perpendicular to the second metal strip. 如請求項1所述之去耦合電路，其中該二天線相距一第一距離，該第一金屬條與該二天線中較近之一天線相距一第二距離，該第二金屬條與該二天線中較近之一天線相距一第三距離，該第一距離大於該第二距離與該第三距離之一總和。 The decoupling circuit of claim 1, wherein the two antennas are separated by a first distance, the first metal strip is separated from the antenna of the two antennas by a second distance, the second metal strip and the second metal One of the antennas in the line is separated by a third distance, and the first distance is greater than a sum of the second distance and the third distance. 如請求項2所述之去耦合電路，其中該二天線分別用來收發一 特定頻段之無線訊號，該第二距離或該第三距離大致等於該無線訊號的四分之一波長。 The decoupling circuit of claim 2, wherein the two antennas are respectively used for transmitting and receiving a wireless signal of a specific frequency band, the second distance or the third distance being substantially equal to a quarter wavelength of the wireless signal. 如請求項3所述之去耦合電路，其中該第一梳形結構及該第二梳形結構中任一金屬線段與一相鄰金屬線段之一距離介於該無線訊號的二十分之一波長與十分之一波長之間。 The decoupling circuit of claim 3, wherein one of the first comb structure and the second comb structure is separated from one of the adjacent metal segments by one-twentieth of the wireless signal Between the wavelength and the tenth of a wavelength. 如請求項1所述之去耦合電路，其中該第一金屬條之一長度小於該第二金屬條之一長度。 The decoupling circuit of claim 1, wherein one of the first metal strips has a length that is less than a length of the second metal strip. 如請求項1所述之去耦合電路，其另包含：一第三金屬條，設置於該門框結構外該第一金屬條與該二天線中一天線間，且電性連接於該地端；以及一第四金屬條，設置於該門框結構外該第二金屬條與該二天線中另一天線間，且電性連接於該地端。 The decoupling circuit of claim 1, further comprising: a third metal strip disposed between the first metal strip and an antenna of the two antennas outside the frame structure, and electrically connected to the ground end; And a fourth metal strip disposed between the second metal strip and the other antenna of the two antennas outside the door frame structure and electrically connected to the ground end. 如請求項1所述之去耦合電路，其中該基板係一電子裝置之一殼體的一部分。 The decoupling circuit of claim 1, wherein the substrate is part of a housing of an electronic device. 如請求項1所述之去耦合電路，其中該基板具有至少一起伏。 The decoupling circuit of claim 1, wherein the substrate has at least one volt. 如請求項8所述之去耦合電路，其係以一雷射直接成型方式設置於該基板。 The decoupling circuit of claim 8 is disposed on the substrate in a laser direct molding manner. 如請求項1所述之去耦合電路，其中該二天線皆為平面式單極天線。 The decoupling circuit of claim 1, wherein the two antennas are planar monopole antennas. 一種天線裝置，包含有：一基板；二天線，大致對稱地設置於該基板上；以及一去耦合電路，包含有：一第一金屬條，設置於該基板上該二天線間，且電性連接於一地端；一第二金屬條，設置於該基板上該二天線間，大致平行於該第一金屬條，且電性連接於該地端；一金屬連接條，設置於該基板上該二天線間，並電性連接該第一金屬條之一端及該第二金屬條之一端，以與該第一金屬條及該第二金屬條大致形成一門框結構；一第一梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第一金屬條，並與該第一金屬條垂直；以及一第二梳形結構，包含有複數個金屬線段，以相互平行方式設置於該基板上並電性連接於該第二金屬條，並與該第二金屬條垂直。 An antenna device includes: a substrate; two antennas disposed substantially symmetrically on the substrate; and a decoupling circuit comprising: a first metal strip disposed on the substrate between the two antennas, and electrically Connected to a ground end; a second metal strip is disposed on the substrate between the two antennas, substantially parallel to the first metal strip, and electrically connected to the ground end; a metal connecting strip is disposed on the substrate Between the two antennas, electrically connecting one end of the first metal strip and one end of the second metal strip to form a door frame structure with the first metal strip and the second metal strip; a first comb structure Included in the plurality of metal segments, disposed on the substrate in parallel with each other and electrically connected to the first metal strip and perpendicular to the first metal strip; and a second comb structure including a plurality of metals The line segments are disposed on the substrate in a mutually parallel manner and are electrically connected to the second metal strip and perpendicular to the second metal strip. 如請求項11所述之天線裝置，其中該二天線相距一第一距離， 該第一金屬條與該二天線中較近之一天線相距一第二距離，該第二金屬條與該二天線中較近之一天線相距一第三距離，該第一距離大於該第二距離與該第三距離之一總和。 The antenna device of claim 11, wherein the two antennas are separated by a first distance, The first metal strip is at a second distance from one of the two antennas, and the second metal strip is at a third distance from one of the two antennas. The first distance is greater than the second distance. The distance is summed with one of the third distances. 如請求項12所述之天線裝置，其中該二天線分別用來收發一特定頻段之無線訊號，該第二距離或該第三距離大致等於該無線訊號的四分之一波長。 The antenna device of claim 12, wherein the two antennas are respectively configured to receive and receive a wireless signal of a specific frequency band, and the second distance or the third distance is substantially equal to a quarter wavelength of the wireless signal. 如請求項13所述之天線裝置，其中該第一梳形結構及該第二梳形結構中任一金屬線段與一相鄰金屬線段之一距離介於該無線訊號的二十分之一波長與十分之一波長之間。 The antenna device of claim 13, wherein any one of the first comb structure and the second comb structure is separated from one of the adjacent metal segments by a wavelength of one-twentieth of the wireless signal Between tenth of a wavelength. 如請求項11所述之天線裝置，其中該第一金屬條之一長度小於該第二金屬條之一長度。 The antenna device of claim 11, wherein one of the first metal strips has a length that is less than a length of the second metal strip. 如請求項11所述之天線裝置，其中該去耦合電路另包含：一第三金屬條，設置於該門框結構外該第一金屬條與該二天線中一天線間，且電性連接於該地端；以及一第四金屬條，設置於該門框結構外該第二金屬條與該二天線中另一天線間，且電性連接於該地端。 The antenna device of claim 11, wherein the decoupling circuit further comprises: a third metal strip disposed between the first metal strip and an antenna of the two antennas outside the door frame structure, and electrically connected to the antenna And a fourth metal strip disposed between the second metal strip and the other antenna of the two antennas, and electrically connected to the ground end. 如請求項11所述之天線裝置，其中該基板係一電子裝置之一殼體的一部分。 The antenna device of claim 11, wherein the substrate is part of a housing of an electronic device. 如請求項11所述之天線裝置，其中該基板具有至少一起伏。 The antenna device of claim 11, wherein the substrate has at least one volt. 如請求項18所述之天線裝置，其係以一雷射直接成型方式設置於該基板。 The antenna device of claim 18, which is disposed on the substrate in a laser direct molding manner. 如請求項11所述之天線裝置，其中該二天線皆為平面式單極天線。 The antenna device of claim 11, wherein the two antennas are planar monopole antennas.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI556508B (en) * 2014-09-05 2016-11-01 環鴻科技股份有限公司 Antenna apparatus
CN106486727A (en) * 2015-08-24 2017-03-08 吴家和 Reduce the micro-strip isolation structure of crosstalk
TWI575808B (en) * 2015-08-24 2017-03-21 吳家和 Isolation structure of microstrip for reducing crosstalk
TWI726694B (en) * 2020-04-21 2021-05-01 國立臺灣科技大學 Phase controlled optical waveguide antenna array
CN112997359A (en) * 2018-12-17 2021-06-18 华为技术有限公司 Antenna array electromagnetic decoupling method and structure

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI539674B (en) * 2014-09-26 2016-06-21 宏碁股份有限公司 Antenna system
CN205029016U (en) * 2015-10-14 2016-02-10 中兴通讯股份有限公司 Multiple -input multiple -output antenna and electronic equipment
CN105896031A (en) * 2015-11-11 2016-08-24 乐卡汽车智能科技（北京）有限公司 Vehicle-mounted antenna system and automobile
DE102016118629A1 (en) * 2016-06-09 2017-12-14 Hirschmann Car Communication Gmbh Communication system of a vehicle with improved thermal management
JP6792406B2 (en) * 2016-10-21 2020-11-25 株式会社ヨコオ In-vehicle antenna device
CN108428998B (en) * 2018-01-31 2019-12-06 西安电子科技大学 Millimeter wave dielectric resonator MIMO antenna applied to 5G mobile communication
CN110611153B (en) * 2018-06-14 2024-03-01 上海汽车集团股份有限公司 Metamaterial and vehicle-mounted antenna system
CN111146592B (en) * 2018-11-02 2023-10-13 中兴通讯股份有限公司 Antenna structure and terminal
CN111384595B (en) * 2018-12-29 2021-07-16 华为技术有限公司 MIMO antenna and base station
CN111384592B (en) * 2020-02-25 2024-01-30 福瑞泰克智能***有限公司 Antenna device and radar
CN112164888B (en) * 2020-08-21 2024-05-03 西安朗普达通信科技有限公司 Method for improving coupling performance of multi-antenna system by decoupling wave guide device
CN112563748B (en) * 2020-12-01 2023-05-23 西安朗普达通信科技有限公司 Asymmetric decoupling structure and base station antenna system
CN112768933A (en) * 2020-12-30 2021-05-07 深圳市信丰伟业科技有限公司 Novel low-frequency decoupling structure and small-sized terminal equipment
WO2023083462A1 (en) * 2021-11-12 2023-05-19 Telefonaktiebolaget Lm Ericsson (Publ) Radiator unit for cross-band suppression
SE545791C2 (en) * 2022-05-18 2024-02-06 Saab Ab An antenna arrangement
CN118054207A (en) * 2022-11-10 2024-05-17 华为技术有限公司 Antenna, decoupling structure and communication equipment
CN118281563A (en) * 2022-12-30 2024-07-02 Oppo广东移动通信有限公司 Antenna assembly and electronic equipment

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE516842C2 (en) * 2000-07-10 2002-03-12 Allgon Ab Antenna device for a portable radio communication device
TWM293545U (en) * 2006-01-13 2006-07-01 Cameo Communications Inc Patch antenna, and wireless networking device with the same
TWI396331B (en) * 2007-04-17 2013-05-11 Quanta Comp Inc Dual frequency antenna
JP4966125B2 (en) * 2007-07-27 2012-07-04 株式会社東芝 Antenna device and radio
US7916089B2 (en) * 2008-01-04 2011-03-29 Apple Inc. Antenna isolation for portable electronic devices
TWM349564U (en) * 2008-05-15 2009-01-21 Cybertan Technology Inc Antenna structure capable of enhancing the close inter-antenna isolation
TW201134007A (en) * 2010-03-22 2011-10-01 Gemtek Technology Co Ltd High isolation and multiple-band antenna set incorporated with wireless fidelity antennas and worldwide interoperability for microwave access antennas
CN202058854U (en) * 2010-12-08 2011-11-30 上海安费诺永亿通讯电子有限公司 MIMO antenna structure realizing multi-frequency high isolation
JP5162012B1 (en) * 2011-08-31 2013-03-13 株式会社東芝 ANTENNA DEVICE AND ELECTRONIC DEVICE HAVING THE ANTENNA DEVICE

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI556508B (en) * 2014-09-05 2016-11-01 環鴻科技股份有限公司 Antenna apparatus
CN106486727A (en) * 2015-08-24 2017-03-08 吴家和 Reduce the micro-strip isolation structure of crosstalk
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CN106486727B (en) * 2015-08-24 2020-07-14 吴家和 Microstrip isolation structure for reducing crosstalk
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TWI726694B (en) * 2020-04-21 2021-05-01 國立臺灣科技大學 Phase controlled optical waveguide antenna array

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